Codeforces Round #658 (Div. 2) A-D

A：显然都取长度为1，不只长度优，并且更容易构造。ios #include <bits/stdc++.h> using namespace std; typedef long long ll; #define ls (o<<1) #define rs (o<<1|1) #define pb push_back const double PI= acos(-1.0); const int M = 1

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